<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2013 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    1.7.9, 2013-06-02
 */


/**
 * PHPExcel_Writer_Excel2007_Worksheet
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel2007_Worksheet extends PHPExcel_Writer_Excel2007_WriterPart {
	/**
	 * Write worksheet to XML format
	 *
	 * @param    PHPExcel_Worksheet $pSheet
	 * @param    string[]           $pStringTable
	 * @param    boolean            $includeCharts Flag indicating if we should write charts
	 *
	 * @return    string                    XML Output
	 * @throws    PHPExcel_Writer_Exception
	 */
	public function writeWorksheet($pSheet = null, $pStringTable = null, $includeCharts = false) {
		if (!is_null($pSheet))
		{
			// Create XML writer
			$objWriter = null;
			if ($this->getParentWriter()->getUseDiskCaching())
			{
				$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
			}
			else
			{
				$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
			}

			// XML header
			$objWriter->startDocument('1.0', 'UTF-8', 'yes');

			// Worksheet
			$objWriter->startElement('worksheet');
			$objWriter->writeAttribute('xml:space', 'preserve');
			$objWriter->writeAttribute('xmlns', 'http://schemas.openxmlformats.org/spreadsheetml/2006/main');
			$objWriter->writeAttribute('xmlns:r', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships');

			// sheetPr
			$this->_writeSheetPr($objWriter, $pSheet);

			// Dimension
			$this->_writeDimension($objWriter, $pSheet);

			// sheetViews
			$this->_writeSheetViews($objWriter, $pSheet);

			// sheetFormatPr
			$this->_writeSheetFormatPr($objWriter, $pSheet);

			// cols
			$this->_writeCols($objWriter, $pSheet);

			// sheetData
			$this->_writeSheetData($objWriter, $pSheet, $pStringTable);

			// sheetProtection
			$this->_writeSheetProtection($objWriter, $pSheet);

			// protectedRanges
			$this->_writeProtectedRanges($objWriter, $pSheet);

			// autoFilter
			$this->_writeAutoFilter($objWriter, $pSheet);

			// mergeCells
			$this->_writeMergeCells($objWriter, $pSheet);

			// conditionalFormatting
			$this->_writeConditionalFormatting($objWriter, $pSheet);

			// dataValidations
			$this->_writeDataValidations($objWriter, $pSheet);

			// hyperlinks
			$this->_writeHyperlinks($objWriter, $pSheet);

			// Print options
			$this->_writePrintOptions($objWriter, $pSheet);

			// Page margins
			$this->_writePageMargins($objWriter, $pSheet);

			// Page setup
			$this->_writePageSetup($objWriter, $pSheet);

			// Header / footer
			$this->_writeHeaderFooter($objWriter, $pSheet);

			// Breaks
			$this->_writeBreaks($objWriter, $pSheet);

			// Drawings and/or Charts
			$this->_writeDrawings($objWriter, $pSheet, $includeCharts);

			// LegacyDrawing
			$this->_writeLegacyDrawing($objWriter, $pSheet);

			// LegacyDrawingHF
			$this->_writeLegacyDrawingHF($objWriter, $pSheet);

			$objWriter->endElement();

			// Return
			return $objWriter->getData();
		}
		else
		{
			throw new PHPExcel_Writer_Exception("Invalid PHPExcel_Worksheet object passed.");
		}
	}

	/**
	 * Write SheetPr
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeSheetPr(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// sheetPr
		$objWriter->startElement('sheetPr');
		//$objWriter->writeAttribute('codeName',		$pSheet->getTitle());
		$autoFilterRange = $pSheet->getAutoFilter()->getRange();
		if (!empty($autoFilterRange))
		{
			$objWriter->writeAttribute('filterMode', 1);
			$pSheet->getAutoFilter()->showHideRows();
		}

		// tabColor
		if ($pSheet->isTabColorSet())
		{
			$objWriter->startElement('tabColor');
			$objWriter->writeAttribute('rgb', $pSheet->getTabColor()->getARGB());
			$objWriter->endElement();
		}

		// outlinePr
		$objWriter->startElement('outlinePr');
		$objWriter->writeAttribute('summaryBelow', ($pSheet->getShowSummaryBelow() ? '1' : '0'));
		$objWriter->writeAttribute('summaryRight', ($pSheet->getShowSummaryRight() ? '1' : '0'));
		$objWriter->endElement();

		// pageSetUpPr
		if ($pSheet->getPageSetup()->getFitToPage())
		{
			$objWriter->startElement('pageSetUpPr');
			$objWriter->writeAttribute('fitToPage', '1');
			$objWriter->endElement();
		}

		$objWriter->endElement();
	}

	/**
	 * Write Dimension
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeDimension(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// dimension
		$objWriter->startElement('dimension');
		$objWriter->writeAttribute('ref', $pSheet->calculateWorksheetDimension());
		$objWriter->endElement();
	}

	/**
	 * Write SheetViews
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeSheetViews(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// sheetViews
		$objWriter->startElement('sheetViews');

		// Sheet selected?
		$sheetSelected = false;
		if ($this->getParentWriter()->getPHPExcel()->getIndex($pSheet) == $this->getParentWriter()->getPHPExcel()->getActiveSheetIndex())
			$sheetSelected = true;


		// sheetView
		$objWriter->startElement('sheetView');
		$objWriter->writeAttribute('tabSelected', $sheetSelected ? '1' : '0');
		$objWriter->writeAttribute('workbookViewId', '0');

		// Zoom scales
		if ($pSheet->getSheetView()->getZoomScale() != 100)
		{
			$objWriter->writeAttribute('zoomScale', $pSheet->getSheetView()->getZoomScale());
		}
		if ($pSheet->getSheetView()->getZoomScaleNormal() != 100)
		{
			$objWriter->writeAttribute('zoomScaleNormal', $pSheet->getSheetView()->getZoomScaleNormal());
		}

		// View Layout Type
		if ($pSheet->getSheetView()->getView() !== PHPExcel_Worksheet_SheetView::SHEETVIEW_NORMAL)
		{
			$objWriter->writeAttribute('view', $pSheet->getSheetView()->getView());
		}

		// Gridlines
		if ($pSheet->getShowGridlines())
		{
			$objWriter->writeAttribute('showGridLines', 'true');
		}
		else
		{
			$objWriter->writeAttribute('showGridLines', 'false');
		}

		// Row and column headers
		if ($pSheet->getShowRowColHeaders())
		{
			$objWriter->writeAttribute('showRowColHeaders', '1');
		}
		else
		{
			$objWriter->writeAttribute('showRowColHeaders', '0');
		}

		// Right-to-left
		if ($pSheet->getRightToLeft())
		{
			$objWriter->writeAttribute('rightToLeft', 'true');
		}

		$activeCell = $pSheet->getActiveCell();

		// Pane
		$pane = '';
		$topLeftCell = $pSheet->getFreezePane();
		if (($topLeftCell != '') && ($topLeftCell != 'A1'))
		{
			$activeCell = $topLeftCell;
			// Calculate freeze coordinates
			$xSplit = $ySplit = 0;

			list($xSplit, $ySplit) = PHPExcel_Cell::coordinateFromString($topLeftCell);
			$xSplit = PHPExcel_Cell::columnIndexFromString($xSplit);

			// pane
			$pane = 'topRight';
			$objWriter->startElement('pane');
			if ($xSplit > 1)
				$objWriter->writeAttribute('xSplit', $xSplit - 1);
			if ($ySplit > 1)
			{
				$objWriter->writeAttribute('ySplit', $ySplit - 1);
				$pane = ($xSplit > 1) ? 'bottomRight' : 'bottomLeft';
			}
			$objWriter->writeAttribute('topLeftCell', $topLeftCell);
			$objWriter->writeAttribute('activePane', $pane);
			$objWriter->writeAttribute('state', 'frozen');
			$objWriter->endElement();

			if (($xSplit > 1) && ($ySplit > 1))
			{
				//	Write additional selections if more than two panes (ie both an X and a Y split)
				$objWriter->startElement('selection');
				$objWriter->writeAttribute('pane', 'topRight');
				$objWriter->endElement();
				$objWriter->startElement('selection');
				$objWriter->writeAttribute('pane', 'bottomLeft');
				$objWriter->endElement();
			}
		}

		// Selection
		//				if ($pane != '') {
		//	Only need to write selection element if we have a split pane
		//		We cheat a little by over-riding the active cell selection, setting it to the split cell
		$objWriter->startElement('selection');
		if ($pane != '')
		{
			$objWriter->writeAttribute('pane', $pane);
		}
		$objWriter->writeAttribute('activeCell', $activeCell);
		$objWriter->writeAttribute('sqref', $activeCell);
		$objWriter->endElement();
		//				}

		$objWriter->endElement();

		$objWriter->endElement();
	}

	/**
	 * Write SheetFormatPr
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeSheetFormatPr(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// sheetFormatPr
		$objWriter->startElement('sheetFormatPr');

		// Default row height
		if ($pSheet->getDefaultRowDimension()->getRowHeight() >= 0)
		{
			$objWriter->writeAttribute('customHeight', 'true');
			$objWriter->writeAttribute('defaultRowHeight', PHPExcel_Shared_String::FormatNumber($pSheet->getDefaultRowDimension()->getRowHeight()));
		}
		else
		{
			$objWriter->writeAttribute('defaultRowHeight', '14.4');
		}

		// Set Zero Height row
		if ((string)$pSheet->getDefaultRowDimension()->getzeroHeight() == '1' || strtolower((string)$pSheet->getDefaultRowDimension()->getzeroHeight()) == 'true')
		{
			$objWriter->writeAttribute('zeroHeight', '1');
		}

		// Default column width
		if ($pSheet->getDefaultColumnDimension()->getWidth() >= 0)
		{
			$objWriter->writeAttribute('defaultColWidth', PHPExcel_Shared_String::FormatNumber($pSheet->getDefaultColumnDimension()->getWidth()));
		}

		// Outline level - row
		$outlineLevelRow = 0;
		foreach ($pSheet->getRowDimensions() as $dimension)
		{
			if ($dimension->getOutlineLevel() > $outlineLevelRow)
			{
				$outlineLevelRow = $dimension->getOutlineLevel();
			}
		}
		$objWriter->writeAttribute('outlineLevelRow', (int)$outlineLevelRow);

		// Outline level - column
		$outlineLevelCol = 0;
		foreach ($pSheet->getColumnDimensions() as $dimension)
		{
			if ($dimension->getOutlineLevel() > $outlineLevelCol)
			{
				$outlineLevelCol = $dimension->getOutlineLevel();
			}
		}
		$objWriter->writeAttribute('outlineLevelCol', (int)$outlineLevelCol);

		$objWriter->endElement();
	}

	/**
	 * Write Cols
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeCols(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// cols
		if (count($pSheet->getColumnDimensions()) > 0)
		{
			$objWriter->startElement('cols');

			$pSheet->calculateColumnWidths();

			// Loop through column dimensions
			foreach ($pSheet->getColumnDimensions() as $colDimension)
			{
				// col
				$objWriter->startElement('col');
				$objWriter->writeAttribute('min', PHPExcel_Cell::columnIndexFromString($colDimension->getColumnIndex()));
				$objWriter->writeAttribute('max', PHPExcel_Cell::columnIndexFromString($colDimension->getColumnIndex()));

				if ($colDimension->getWidth() < 0)
				{
					// No width set, apply default of 10
					$objWriter->writeAttribute('width', '9.10');
				}
				else
				{
					// Width set
					$objWriter->writeAttribute('width', PHPExcel_Shared_String::FormatNumber($colDimension->getWidth()));
				}

				// Column visibility
				if ($colDimension->getVisible() == false)
				{
					$objWriter->writeAttribute('hidden', 'true');
				}

				// Auto size?
				if ($colDimension->getAutoSize())
				{
					$objWriter->writeAttribute('bestFit', 'true');
				}

				// Custom width?
				if ($colDimension->getWidth() != $pSheet->getDefaultColumnDimension()->getWidth())
				{
					$objWriter->writeAttribute('customWidth', 'true');
				}

				// Collapsed
				if ($colDimension->getCollapsed() == true)
				{
					$objWriter->writeAttribute('collapsed', 'true');
				}

				// Outline level
				if ($colDimension->getOutlineLevel() > 0)
				{
					$objWriter->writeAttribute('outlineLevel', $colDimension->getOutlineLevel());
				}

				// Style
				$objWriter->writeAttribute('style', $colDimension->getXfIndex());

				$objWriter->endElement();
			}

			$objWriter->endElement();
		}
	}

	/**
	 * Write SheetProtection
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeSheetProtection(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// sheetProtection
		$objWriter->startElement('sheetProtection');

		if ($pSheet->getProtection()->getPassword() != '')
		{
			$objWriter->writeAttribute('password', $pSheet->getProtection()->getPassword());
		}

		$objWriter->writeAttribute('sheet', ($pSheet->getProtection()->getSheet() ? 'true' : 'false'));
		$objWriter->writeAttribute('objects', ($pSheet->getProtection()->getObjects() ? 'true' : 'false'));
		$objWriter->writeAttribute('scenarios', ($pSheet->getProtection()->getScenarios() ? 'true' : 'false'));
		$objWriter->writeAttribute('formatCells', ($pSheet->getProtection()->getFormatCells() ? 'true' : 'false'));
		$objWriter->writeAttribute('formatColumns', ($pSheet->getProtection()->getFormatColumns() ? 'true' : 'false'));
		$objWriter->writeAttribute('formatRows', ($pSheet->getProtection()->getFormatRows() ? 'true' : 'false'));
		$objWriter->writeAttribute('insertColumns', ($pSheet->getProtection()->getInsertColumns() ? 'true' : 'false'));
		$objWriter->writeAttribute('insertRows', ($pSheet->getProtection()->getInsertRows() ? 'true' : 'false'));
		$objWriter->writeAttribute('insertHyperlinks', ($pSheet->getProtection()->getInsertHyperlinks() ? 'true' : 'false'));
		$objWriter->writeAttribute('deleteColumns', ($pSheet->getProtection()->getDeleteColumns() ? 'true' : 'false'));
		$objWriter->writeAttribute('deleteRows', ($pSheet->getProtection()->getDeleteRows() ? 'true' : 'false'));
		$objWriter->writeAttribute('selectLockedCells', ($pSheet->getProtection()->getSelectLockedCells() ? 'true' : 'false'));
		$objWriter->writeAttribute('sort', ($pSheet->getProtection()->getSort() ? 'true' : 'false'));
		$objWriter->writeAttribute('autoFilter', ($pSheet->getProtection()->getAutoFilter() ? 'true' : 'false'));
		$objWriter->writeAttribute('pivotTables', ($pSheet->getProtection()->getPivotTables() ? 'true' : 'false'));
		$objWriter->writeAttribute('selectUnlockedCells', ($pSheet->getProtection()->getSelectUnlockedCells() ? 'true' : 'false'));
		$objWriter->endElement();
	}

	/**
	 * Write ConditionalFormatting
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeConditionalFormatting(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// Conditional id
		$id = 1;

		// Loop through styles in the current worksheet
		foreach ($pSheet->getConditionalStylesCollection() as $cellCoordinate => $conditionalStyles)
		{
			foreach ($conditionalStyles as $conditional)
			{
				// WHY was this again?
				// if ($this->getParentWriter()->getStylesConditionalHashTable()->getIndexForHashCode( $conditional->getHashCode() ) == '') {
				//	continue;
				// }
				if ($conditional->getConditionType() != PHPExcel_Style_Conditional::CONDITION_NONE)
				{
					// conditionalFormatting
					$objWriter->startElement('conditionalFormatting');
					$objWriter->writeAttribute('sqref', $cellCoordinate);

					// cfRule
					$objWriter->startElement('cfRule');
					$objWriter->writeAttribute('type', $conditional->getConditionType());
					$objWriter->writeAttribute('dxfId', $this->getParentWriter()->getStylesConditionalHashTable()->getIndexForHashCode($conditional->getHashCode()));
					$objWriter->writeAttribute('priority', $id++);

					if (($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CELLIS || $conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CONTAINSTEXT) && $conditional->getOperatorType() != PHPExcel_Style_Conditional::OPERATOR_NONE)
					{
						$objWriter->writeAttribute('operator', $conditional->getOperatorType());
					}

					if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CONTAINSTEXT && !is_null($conditional->getText()))
					{
						$objWriter->writeAttribute('text', $conditional->getText());
					}

					if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CONTAINSTEXT && $conditional->getOperatorType() == PHPExcel_Style_Conditional::OPERATOR_CONTAINSTEXT && !is_null($conditional->getText()))
					{
						$objWriter->writeElement('formula', 'NOT(ISERROR(SEARCH("' . $conditional->getText() . '",' . $cellCoordinate . ')))');
					}
					else if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CONTAINSTEXT && $conditional->getOperatorType() == PHPExcel_Style_Conditional::OPERATOR_BEGINSWITH && !is_null($conditional->getText()))
					{
						$objWriter->writeElement('formula', 'LEFT(' . $cellCoordinate . ',' . strlen($conditional->getText()) . ')="' . $conditional->getText() . '"');
					}
					else if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CONTAINSTEXT && $conditional->getOperatorType() == PHPExcel_Style_Conditional::OPERATOR_ENDSWITH && !is_null($conditional->getText()))
					{
						$objWriter->writeElement('formula', 'RIGHT(' . $cellCoordinate . ',' . strlen($conditional->getText()) . ')="' . $conditional->getText() . '"');
					}
					else if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CONTAINSTEXT && $conditional->getOperatorType() == PHPExcel_Style_Conditional::OPERATOR_NOTCONTAINS && !is_null($conditional->getText()))
					{
						$objWriter->writeElement('formula', 'ISERROR(SEARCH("' . $conditional->getText() . '",' . $cellCoordinate . '))');
					}
					else if ($conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CELLIS || $conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_CONTAINSTEXT || $conditional->getConditionType() == PHPExcel_Style_Conditional::CONDITION_EXPRESSION)
					{
						foreach ($conditional->getConditions() as $formula)
						{
							// Formula
							$objWriter->writeElement('formula', $formula);
						}
					}

					$objWriter->endElement();

					$objWriter->endElement();
				}
			}
		}
	}

	/**
	 * Write DataValidations
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeDataValidations(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// Datavalidation collection
		$dataValidationCollection = $pSheet->getDataValidationCollection();

		// Write data validations?
		if (!empty($dataValidationCollection))
		{
			$objWriter->startElement('dataValidations');
			$objWriter->writeAttribute('count', count($dataValidationCollection));

			foreach ($dataValidationCollection as $coordinate => $dv)
			{
				$objWriter->startElement('dataValidation');

				if ($dv->getType() != '')
				{
					$objWriter->writeAttribute('type', $dv->getType());
				}

				if ($dv->getErrorStyle() != '')
				{
					$objWriter->writeAttribute('errorStyle', $dv->getErrorStyle());
				}

				if ($dv->getOperator() != '')
				{
					$objWriter->writeAttribute('operator', $dv->getOperator());
				}

				$objWriter->writeAttribute('allowBlank', ($dv->getAllowBlank() ? '1' : '0'));
				$objWriter->writeAttribute('showDropDown', (!$dv->getShowDropDown() ? '1' : '0'));
				$objWriter->writeAttribute('showInputMessage', ($dv->getShowInputMessage() ? '1' : '0'));
				$objWriter->writeAttribute('showErrorMessage', ($dv->getShowErrorMessage() ? '1' : '0'));

				if ($dv->getErrorTitle() !== '')
				{
					$objWriter->writeAttribute('errorTitle', $dv->getErrorTitle());
				}
				if ($dv->getError() !== '')
				{
					$objWriter->writeAttribute('error', $dv->getError());
				}
				if ($dv->getPromptTitle() !== '')
				{
					$objWriter->writeAttribute('promptTitle', $dv->getPromptTitle());
				}
				if ($dv->getPrompt() !== '')
				{
					$objWriter->writeAttribute('prompt', $dv->getPrompt());
				}

				$objWriter->writeAttribute('sqref', $coordinate);

				if ($dv->getFormula1() !== '')
				{
					$objWriter->writeElement('formula1', $dv->getFormula1());
				}
				if ($dv->getFormula2() !== '')
				{
					$objWriter->writeElement('formula2', $dv->getFormula2());
				}

				$objWriter->endElement();
			}

			$objWriter->endElement();
		}
	}

	/**
	 * Write Hyperlinks
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeHyperlinks(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// Hyperlink collection
		$hyperlinkCollection = $pSheet->getHyperlinkCollection();

		// Relation ID
		$relationId = 1;

		// Write hyperlinks?
		if (!empty($hyperlinkCollection))
		{
			$objWriter->startElement('hyperlinks');

			foreach ($hyperlinkCollection as $coordinate => $hyperlink)
			{
				$objWriter->startElement('hyperlink');

				$objWriter->writeAttribute('ref', $coordinate);
				if (!$hyperlink->isInternal())
				{
					$objWriter->writeAttribute('r:id', 'rId_hyperlink_' . $relationId);
					++$relationId;
				}
				else
				{
					$objWriter->writeAttribute('location', str_replace('sheet://', '', $hyperlink->getUrl()));
				}

				if ($hyperlink->getTooltip() != '')
				{
					$objWriter->writeAttribute('tooltip', $hyperlink->getTooltip());
				}

				$objWriter->endElement();
			}

			$objWriter->endElement();
		}
	}

	/**
	 * Write ProtectedRanges
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeProtectedRanges(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		if (count($pSheet->getProtectedCells()) > 0)
		{
			// protectedRanges
			$objWriter->startElement('protectedRanges');

			// Loop protectedRanges
			foreach ($pSheet->getProtectedCells() as $protectedCell => $passwordHash)
			{
				// protectedRange
				$objWriter->startElement('protectedRange');
				$objWriter->writeAttribute('name', 'p' . md5($protectedCell));
				$objWriter->writeAttribute('sqref', $protectedCell);
				if (!empty($passwordHash))
				{
					$objWriter->writeAttribute('password', $passwordHash);
				}
				$objWriter->endElement();
			}

			$objWriter->endElement();
		}
	}

	/**
	 * Write MergeCells
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeMergeCells(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		if (count($pSheet->getMergeCells()) > 0)
		{
			// mergeCells
			$objWriter->startElement('mergeCells');

			// Loop mergeCells
			foreach ($pSheet->getMergeCells() as $mergeCell)
			{
				// mergeCell
				$objWriter->startElement('mergeCell');
				$objWriter->writeAttribute('ref', $mergeCell);
				$objWriter->endElement();
			}

			$objWriter->endElement();
		}
	}

	/**
	 * Write PrintOptions
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writePrintOptions(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// printOptions
		$objWriter->startElement('printOptions');

		$objWriter->writeAttribute('gridLines', ($pSheet->getPrintGridlines() ? 'true' : 'false'));
		$objWriter->writeAttribute('gridLinesSet', 'true');

		if ($pSheet->getPageSetup()->getHorizontalCentered())
		{
			$objWriter->writeAttribute('horizontalCentered', 'true');
		}

		if ($pSheet->getPageSetup()->getVerticalCentered())
		{
			$objWriter->writeAttribute('verticalCentered', 'true');
		}

		$objWriter->endElement();
	}

	/**
	 * Write PageMargins
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writePageMargins(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// pageMargins
		$objWriter->startElement('pageMargins');
		$objWriter->writeAttribute('left', PHPExcel_Shared_String::FormatNumber($pSheet->getPageMargins()->getLeft()));
		$objWriter->writeAttribute('right', PHPExcel_Shared_String::FormatNumber($pSheet->getPageMargins()->getRight()));
		$objWriter->writeAttribute('top', PHPExcel_Shared_String::FormatNumber($pSheet->getPageMargins()->getTop()));
		$objWriter->writeAttribute('bottom', PHPExcel_Shared_String::FormatNumber($pSheet->getPageMargins()->getBottom()));
		$objWriter->writeAttribute('header', PHPExcel_Shared_String::FormatNumber($pSheet->getPageMargins()->getHeader()));
		$objWriter->writeAttribute('footer', PHPExcel_Shared_String::FormatNumber($pSheet->getPageMargins()->getFooter()));
		$objWriter->endElement();
	}

	/**
	 * Write AutoFilter
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeAutoFilter(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		$autoFilterRange = $pSheet->getAutoFilter()->getRange();
		if (!empty($autoFilterRange))
		{
			// autoFilter
			$objWriter->startElement('autoFilter');

			// Strip any worksheet reference from the filter coordinates
			$range = PHPExcel_Cell::splitRange($autoFilterRange);
			$range = $range[0];
			//	Strip any worksheet ref
			if (strpos($range[0], '!') !== false)
			{
				list($ws, $range[0]) = explode('!', $range[0]);
			}
			$range = implode(':', $range);

			$objWriter->writeAttribute('ref', str_replace('$', '', $range));

			$columns = $pSheet->getAutoFilter()->getColumns();
			if (count($columns > 0))
			{
				foreach ($columns as $columnID => $column)
				{
					$rules = $column->getRules();
					if (count($rules > 0))
					{
						$objWriter->startElement('filterColumn');
						$objWriter->writeAttribute('colId', $pSheet->getAutoFilter()->getColumnOffset($columnID));

						$objWriter->startElement($column->getFilterType());
						if ($column->getJoin() == PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_COLUMN_JOIN_AND)
						{
							$objWriter->writeAttribute('and', 1);
						}

						foreach ($rules as $rule)
						{
							if (($column->getFilterType() === PHPExcel_Worksheet_AutoFilter_Column::AUTOFILTER_FILTERTYPE_FILTER) && ($rule->getOperator() === PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_EQUAL) && ($rule->getValue() === ''))
							{
								//	Filter rule for Blanks
								$objWriter->writeAttribute('blank', 1);
							}
							elseif ($rule->getRuleType() === PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DYNAMICFILTER)
							{
								//	Dynamic Filter Rule
								$objWriter->writeAttribute('type', $rule->getGrouping());
								$val = $column->getAttribute('val');
								if ($val !== null)
								{
									$objWriter->writeAttribute('val', $val);
								}
								$maxVal = $column->getAttribute('maxVal');
								if ($maxVal !== null)
								{
									$objWriter->writeAttribute('maxVal', $maxVal);
								}
							}
							elseif ($rule->getRuleType() === PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_TOPTENFILTER)
							{
								//	Top 10 Filter Rule
								$objWriter->writeAttribute('val', $rule->getValue());
								$objWriter->writeAttribute('percent', (($rule->getOperator() === PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_TOPTEN_PERCENT) ? '1' : '0'));
								$objWriter->writeAttribute('top', (($rule->getGrouping() === PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_TOPTEN_TOP) ? '1' : '0'));
							}
							else
							{
								//	Filter, DateGroupItem or CustomFilter
								$objWriter->startElement($rule->getRuleType());

								if ($rule->getOperator() !== PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_COLUMN_RULE_EQUAL)
								{
									$objWriter->writeAttribute('operator', $rule->getOperator());
								}
								if ($rule->getRuleType() === PHPExcel_Worksheet_AutoFilter_Column_Rule::AUTOFILTER_RULETYPE_DATEGROUP)
								{
									// Date Group filters
									foreach ($rule->getValue() as $key => $value)
									{
										if ($value > '')
											$objWriter->writeAttribute($key, $value);
									}
									$objWriter->writeAttribute('dateTimeGrouping', $rule->getGrouping());
								}
								else
								{
									$objWriter->writeAttribute('val', $rule->getValue());
								}

								$objWriter->endElement();
							}
						}

						$objWriter->endElement();

						$objWriter->endElement();
					}
				}
			}

			$objWriter->endElement();
		}
	}

	/**
	 * Write PageSetup
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writePageSetup(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// pageSetup
		$objWriter->startElement('pageSetup');
		$objWriter->writeAttribute('paperSize', $pSheet->getPageSetup()->getPaperSize());
		$objWriter->writeAttribute('orientation', $pSheet->getPageSetup()->getOrientation());

		if (!is_null($pSheet->getPageSetup()->getScale()))
		{
			$objWriter->writeAttribute('scale', $pSheet->getPageSetup()->getScale());
		}
		if (!is_null($pSheet->getPageSetup()->getFitToHeight()))
		{
			$objWriter->writeAttribute('fitToHeight', $pSheet->getPageSetup()->getFitToHeight());
		}
		else
		{
			$objWriter->writeAttribute('fitToHeight', '0');
		}
		if (!is_null($pSheet->getPageSetup()->getFitToWidth()))
		{
			$objWriter->writeAttribute('fitToWidth', $pSheet->getPageSetup()->getFitToWidth());
		}
		else
		{
			$objWriter->writeAttribute('fitToWidth', '0');
		}
		if (!is_null($pSheet->getPageSetup()->getFirstPageNumber()))
		{
			$objWriter->writeAttribute('firstPageNumber', $pSheet->getPageSetup()->getFirstPageNumber());
			$objWriter->writeAttribute('useFirstPageNumber', '1');
		}

		$objWriter->endElement();
	}

	/**
	 * Write Header / Footer
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeHeaderFooter(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// headerFooter
		$objWriter->startElement('headerFooter');
		$objWriter->writeAttribute('differentOddEven', ($pSheet->getHeaderFooter()->getDifferentOddEven() ? 'true' : 'false'));
		$objWriter->writeAttribute('differentFirst', ($pSheet->getHeaderFooter()->getDifferentFirst() ? 'true' : 'false'));
		$objWriter->writeAttribute('scaleWithDoc', ($pSheet->getHeaderFooter()->getScaleWithDocument() ? 'true' : 'false'));
		$objWriter->writeAttribute('alignWithMargins', ($pSheet->getHeaderFooter()->getAlignWithMargins() ? 'true' : 'false'));

		$objWriter->writeElement('oddHeader', $pSheet->getHeaderFooter()->getOddHeader());
		$objWriter->writeElement('oddFooter', $pSheet->getHeaderFooter()->getOddFooter());
		$objWriter->writeElement('evenHeader', $pSheet->getHeaderFooter()->getEvenHeader());
		$objWriter->writeElement('evenFooter', $pSheet->getHeaderFooter()->getEvenFooter());
		$objWriter->writeElement('firstHeader', $pSheet->getHeaderFooter()->getFirstHeader());
		$objWriter->writeElement('firstFooter', $pSheet->getHeaderFooter()->getFirstFooter());
		$objWriter->endElement();
	}

	/**
	 * Write Breaks
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeBreaks(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// Get row and column breaks
		$aRowBreaks = array();
		$aColumnBreaks = array();
		foreach ($pSheet->getBreaks() as $cell => $breakType)
		{
			if ($breakType == PHPExcel_Worksheet::BREAK_ROW)
			{
				$aRowBreaks[] = $cell;
			}
			else if ($breakType == PHPExcel_Worksheet::BREAK_COLUMN)
			{
				$aColumnBreaks[] = $cell;
			}
		}

		// rowBreaks
		if (!empty($aRowBreaks))
		{
			$objWriter->startElement('rowBreaks');
			$objWriter->writeAttribute('count', count($aRowBreaks));
			$objWriter->writeAttribute('manualBreakCount', count($aRowBreaks));

			foreach ($aRowBreaks as $cell)
			{
				$coords = PHPExcel_Cell::coordinateFromString($cell);

				$objWriter->startElement('brk');
				$objWriter->writeAttribute('id', $coords[1]);
				$objWriter->writeAttribute('man', '1');
				$objWriter->endElement();
			}

			$objWriter->endElement();
		}

		// Second, write column breaks
		if (!empty($aColumnBreaks))
		{
			$objWriter->startElement('colBreaks');
			$objWriter->writeAttribute('count', count($aColumnBreaks));
			$objWriter->writeAttribute('manualBreakCount', count($aColumnBreaks));

			foreach ($aColumnBreaks as $cell)
			{
				$coords = PHPExcel_Cell::coordinateFromString($cell);

				$objWriter->startElement('brk');
				$objWriter->writeAttribute('id', PHPExcel_Cell::columnIndexFromString($coords[0]) - 1);
				$objWriter->writeAttribute('man', '1');
				$objWriter->endElement();
			}

			$objWriter->endElement();
		}
	}

	/**
	 * Write SheetData
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter    XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet       Worksheet
	 * @param    string[]                  $pStringTable String table
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeSheetData(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null, $pStringTable = null) {
		if (is_array($pStringTable))
		{
			// Flipped stringtable, for faster index searching
			$aFlippedStringTable = $this->getParentWriter()->getWriterPart('stringtable')->flipStringTable($pStringTable);

			// sheetData
			$objWriter->startElement('sheetData');

			// Get column count
			$colCount = PHPExcel_Cell::columnIndexFromString($pSheet->getHighestColumn());

			// Highest row number
			$highestRow = $pSheet->getHighestRow();

			// Loop through cells
			$cellsByRow = array();
			foreach ($pSheet->getCellCollection() as $cellID)
			{
				$cellAddress = PHPExcel_Cell::coordinateFromString($cellID);
				$cellsByRow[$cellAddress[1]][] = $cellID;
			}

			$currentRow = 0;
			while ($currentRow++ < $highestRow)
			{
				// Get row dimension
				$rowDimension = $pSheet->getRowDimension($currentRow);

				// Write current row?
				$writeCurrentRow = isset($cellsByRow[$currentRow]) || $rowDimension->getRowHeight() >= 0 || $rowDimension->getVisible() == false || $rowDimension->getCollapsed() == true || $rowDimension->getOutlineLevel() > 0 || $rowDimension->getXfIndex() !== null;

				if ($writeCurrentRow)
				{
					// Start a new row
					$objWriter->startElement('row');
					$objWriter->writeAttribute('r', $currentRow);
					$objWriter->writeAttribute('spans', '1:' . $colCount);

					// Row dimensions
					if ($rowDimension->getRowHeight() >= 0)
					{
						$objWriter->writeAttribute('customHeight', '1');
						$objWriter->writeAttribute('ht', PHPExcel_Shared_String::FormatNumber($rowDimension->getRowHeight()));
					}

					// Row visibility
					if ($rowDimension->getVisible() == false)
					{
						$objWriter->writeAttribute('hidden', 'true');
					}

					// Collapsed
					if ($rowDimension->getCollapsed() == true)
					{
						$objWriter->writeAttribute('collapsed', 'true');
					}

					// Outline level
					if ($rowDimension->getOutlineLevel() > 0)
					{
						$objWriter->writeAttribute('outlineLevel', $rowDimension->getOutlineLevel());
					}

					// Style
					if ($rowDimension->getXfIndex() !== null)
					{
						$objWriter->writeAttribute('s', $rowDimension->getXfIndex());
						$objWriter->writeAttribute('customFormat', '1');
					}

					// Write cells
					if (isset($cellsByRow[$currentRow]))
					{
						foreach ($cellsByRow[$currentRow] as $cellAddress)
						{
							// Write cell
							$this->_writeCell($objWriter, $pSheet, $cellAddress, $pStringTable, $aFlippedStringTable);
						}
					}

					// End row
					$objWriter->endElement();
				}
			}

			$objWriter->endElement();
		}
		else
		{
			throw new PHPExcel_Writer_Exception("Invalid parameters passed.");
		}
	}

	/**
	 * Write Cell
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter           XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet              Worksheet
	 * @param    PHPExcel_Cell             $pCellAddress        Cell Address
	 * @param    string[]                  $pStringTable        String table
	 * @param    string[]                  $pFlippedStringTable String table (flipped), for faster index searching
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeCell(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null, $pCellAddress = null, $pStringTable = null, $pFlippedStringTable = null) {
		if (is_array($pStringTable) && is_array($pFlippedStringTable))
		{
			// Cell
			$pCell = $pSheet->getCell($pCellAddress);
			$objWriter->startElement('c');
			$objWriter->writeAttribute('r', $pCellAddress);

			// Sheet styles
			if ($pCell->getXfIndex() != '')
			{
				$objWriter->writeAttribute('s', $pCell->getXfIndex());
			}

			// If cell value is supplied, write cell value
			$cellValue = $pCell->getValue();
			if (is_object($cellValue) || $cellValue !== '')
			{
				// Map type
				$mappedType = $pCell->getDataType();

				// Write data type depending on its type
				switch (strtolower($mappedType))
				{
					case 'inlinestr': // Inline string
					case 's': // String
					case 'b': // Boolean
						$objWriter->writeAttribute('t', $mappedType);
						break;
					case 'f': // Formula
						$calculatedValue = ($this->getParentWriter()->getPreCalculateFormulas()) ? $pCell->getCalculatedValue() : $cellValue;
						if (is_string($calculatedValue))
						{
							$objWriter->writeAttribute('t', 'str');
						}
						break;
					case 'e': // Error
						$objWriter->writeAttribute('t', $mappedType);
				}

				// Write data depending on its type
				switch (strtolower($mappedType))
				{
					case 'inlinestr': // Inline string
						if (!$cellValue instanceof PHPExcel_RichText)
						{
							$objWriter->writeElement('t', PHPExcel_Shared_String::ControlCharacterPHP2OOXML(htmlspecialchars($cellValue)));
						}
						else if ($cellValue instanceof PHPExcel_RichText)
						{
							$objWriter->startElement('is');
							$this->getParentWriter()->getWriterPart('stringtable')->writeRichText($objWriter, $cellValue);
							$objWriter->endElement();
						}

						break;
					case 's': // String
						if (!$cellValue instanceof PHPExcel_RichText)
						{
							if (isset($pFlippedStringTable[$cellValue]))
							{
								$objWriter->writeElement('v', $pFlippedStringTable[$cellValue]);
							}
						}
						else if ($cellValue instanceof PHPExcel_RichText)
						{
							$objWriter->writeElement('v', $pFlippedStringTable[$cellValue->getHashCode()]);
						}

						break;
					case 'f': // Formula
						$attributes = $pCell->getFormulaAttributes();
						if ($attributes['t'] == 'array')
						{
							$objWriter->startElement('f');
							$objWriter->writeAttribute('t', 'array');
							$objWriter->writeAttribute('ref', $pCellAddress);
							$objWriter->writeAttribute('aca', '1');
							$objWriter->writeAttribute('ca', '1');
							$objWriter->text(substr($cellValue, 1));
							$objWriter->endElement();
						}
						else
						{
							$objWriter->writeElement('f', substr($cellValue, 1));
						}
						if ($this->getParentWriter()->getOffice2003Compatibility() === false)
						{
							if ($this->getParentWriter()->getPreCalculateFormulas())
							{
								//								$calculatedValue = $pCell->getCalculatedValue();
								if (!is_array($calculatedValue) && substr($calculatedValue, 0, 1) != '#')
								{
									$objWriter->writeElement('v', PHPExcel_Shared_String::FormatNumber($calculatedValue));
								}
								else
								{
									$objWriter->writeElement('v', '0');
								}
							}
							else
							{
								$objWriter->writeElement('v', '0');
							}
						}
						break;
					case 'n': // Numeric
						// force point as decimal separator in case current locale uses comma
						$objWriter->writeElement('v', str_replace(',', '.', $cellValue));
						break;
					case 'b': // Boolean
						$objWriter->writeElement('v', ($cellValue ? '1' : '0'));
						break;
					case 'e': // Error
						if (substr($cellValue, 0, 1) == '=')
						{
							$objWriter->writeElement('f', substr($cellValue, 1));
							$objWriter->writeElement('v', substr($cellValue, 1));
						}
						else
						{
							$objWriter->writeElement('v', $cellValue);
						}

						break;
				}
			}

			$objWriter->endElement();
		}
		else
		{
			throw new PHPExcel_Writer_Exception("Invalid parameters passed.");
		}
	}

	/**
	 * Write Drawings
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter     XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet        Worksheet
	 * @param    boolean                   $includeCharts Flag indicating if we should include drawing details for charts
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeDrawings(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null, $includeCharts = false) {
		$chartCount = ($includeCharts) ? $pSheet->getChartCollection()->count() : 0;
		// If sheet contains drawings, add the relationships
		if (($pSheet->getDrawingCollection()->count() > 0) || ($chartCount > 0))
		{
			$objWriter->startElement('drawing');
			$objWriter->writeAttribute('r:id', 'rId1');
			$objWriter->endElement();
		}
	}

	/**
	 * Write LegacyDrawing
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeLegacyDrawing(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// If sheet contains comments, add the relationships
		if (count($pSheet->getComments()) > 0)
		{
			$objWriter->startElement('legacyDrawing');
			$objWriter->writeAttribute('r:id', 'rId_comments_vml1');
			$objWriter->endElement();
		}
	}

	/**
	 * Write LegacyDrawingHF
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Worksheet        $pSheet    Worksheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeLegacyDrawingHF(PHPExcel_Shared_XMLWriter $objWriter = null, PHPExcel_Worksheet $pSheet = null) {
		// If sheet contains images, add the relationships
		if (count($pSheet->getHeaderFooter()->getImages()) > 0)
		{
			$objWriter->startElement('legacyDrawingHF');
			$objWriter->writeAttribute('r:id', 'rId_headerfooter_vml1');
			$objWriter->endElement();
		}
	}
}
